Find when Google update imagery in your area

Google now offers a way to be notified when imagery is updated in any given part of the world for both their Google Maps and Google Earth applications. 

Follow Your World (Google registration required) is a free service that allows you to enter the lat/long of a location along with your email address.  Whenever any imagery is updated for that location, an email alert will be sent.  You can sign up for alerts for multiple locations and manage those subscriptions from the Follow Your World application.

Source: http://gislounge.com